Kepler
Si certus es dubita
I don't think the average human body, even with the luck of good genes, is really evolved by nature to survive much past 100.
Which is why we need to create genetic engines that repair cells. Very little of our tissue is actually lasting even a fraction of our lives. What happens is the copying of the copying of the copying introduces errors that build up and lead to massive failure. But if we can retain the pristine original design and pay it forward in regeneration without error, and/or introduce error correction from time to time, maybe we can cut down on a lot of that copy error. We'll still get killed off by the pieces that do last for the full time, but there are fewer of them, and maybe we can then actually design aftermarket replacements for them the way we do with organs now.
I think it will be like fusion power: always 30 years away. But the thing is, eventually -- 50, 100, 250 years from now -- fusion power will happen.
We've really only been a post-magic, thinking, rational species for about 500 years. We've come a long way in that time. I have faith in us, provided we can contain the gorillas in theme park-like reservations (or, ya know, ixne...).
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